Balancing Valves
TA Series 786/787/788/789 and Series 78K
08.16
insertion-type pressure or temperature probes.
All valves are rated from –4°F/–20°C to +250°F/+120°C.
Service will also be governed by the connecting coupling
gasket ratings for grooved and flanged valves.
Insulation kits are available for ½ – 6"/15 – 150 mm
sizes for Series 78K and TA Series 786, 787, 788 and
789 balancing valves.
Product Description:
Tour & Andersson calibrated balancing valves offer a
reliable, simple and cost effective way to measure and
balance all flow rates. Full throttling range is achieved
by 4, 8, 12, 16, 20 or 22 full turns of the handwheel,
enabling a precise setting. This high degree of accurate
adjustment means that the system can be balanced
precisely.
The actual pressure drops in heating and cooling
systems are difficult to establish by calculation because
water flows vary from design flows. They can be
corrected easily by regulating the desired water flow
with Tour & Andersson globe style balancing valves. By
measuring the pressure drop across measuring ports
at a particular handwheel setting, the water flow for
the valve size can be read easily from the appropriate
pressure drop graph or flow balancing wheel. If the flow
does not conform with that specified, adjust the valve
and repeat the measuring procedure until the correct
flow has been obtained.
NOTE: All Tour & Andersson balancing valves include a
concealed memory feature with a locking tamper-proof
setting.
Series 78K and TA Series 786 and 787 valves have an
Ametal® body.
TA Series 788 and 789 balancing valves have ductile
iron bodies and Ametal or ductile iron trim, depending
on size. Test ports feature self-sealing construction for
Job/Owner
Engineer
System No.
Spec Section
Location
Paragraph
Contractor
Approved
Submitted By
Date
Date
victaulic.com | Balancing Valves | TA Series | Publication 08.16
08.16 0930 Rev Q Updated 05/2014
© 2014 Victaulic Company. All rights reserved.
1
victaulic.com | Balancing Valves | TA Series | Publication 08.16
(by others)
ATC
Balancing Valve
RETURN
Coil Hose (2)
Series 78U
COIL
SUPPLY
Coil Hose (1)
Supply
Valve
Victaulic Series 799/79V KOIL-KIT ™ Coil Pack
Note: TA Series 787 shown, other options available.
Balancing valves can be ordered individually or as
a component of the Series 799, 79V, 79B, or 79A
KOIL-KIT Coil Pack. See the Series 799/79V/79B/79A
Contractor Order Form (A) (publication SF-33) for help
ordering your Victaulic KOILKIT Coil Pack.
The Series 79B and Series 79A come standard with the
components listed above, however these two packages
also include the Bypass Option. When choosing a
Victaulic KOIL-KIT Coil Pack with a Bypass Option, the
following components are available as options: Series
78Y with Bypass Tee or Series 78T with Bypass Tee,
a third coil hose, and a bypass valve. (Bypass valve
options consist of Series 78Y, 78T, 78K, 786, 787).
Victaulic KOIL-KIT Coil Packs provide a simplified, quality
coil installation while ensuring optimal hydronic systems
design requirements are met. The Series 799/79V is
suitable for a variety of hot and cold water applications
including treated and untreated water systems.
The Series 79A includes the Bypass Option and the
option to have the ATC valve of your choosing assembled
and shipped with the Victaulic KOIL-KIT Coil Pack.
The Victaulic KOIL-KIT Coil Pack consists of the following
components: Series 78Y Y-Strainer/Ball Valve or Series
78T Ball Valve Union Combination, two Coil Hoses, a
Series 78U Union Port Fitting and a TA balancing valve.
There are two options when ordering a Victaulic KOILKIT Coil Pack: Series 799 KOIL-KIT Coil Pack or Series
79V KOIL-KIT Coil Pack with ATC Valve.
For added convenience, when coil hoses are ordered
as a component of the Series 799 or 79V KOIL-KIT Coil
Pack, all hoses can be provided pre-connected to the
Series 78Y or 78T on the supply side and the Series
78U on the return side (specify connection preference
when ordering).
The Series 799 and Series 79V comes standard with
the components listed above. Additionally, the Series
79V includes the option to have the ATC valve of your
choosing assembled and shipped with the Victaulic
KOIL-KIT Coil Pack. Please note that when ordering a
Series 79V, Victaulic offers one balancing valve, the
Series 78K. Specify either Series 799 or Series 79V
when ordering.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
For information on Victaulic KOIL-KIT Coil Packs in
½ – 2"/15 – 50 mm sizes, refer to publication 08.30.
For information on Victaulic KOIL-KITS for air handling
units in 2 ½ – 6"/65 – 150 mm sizes, refer to publication
08.35.
© 2014 Victaulic Company. All rights reserved.
2
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Seat seal:
Material Specifications:
Series 78K and TA Series, 786, 787, 788, 789: EPDM
Balancing Valves
Stem seals:
Body:
EPDM
Series 78K and TA Series 786, 787: Ametal, (pressure
die cast, nonporous copper alloy)
Probe seals:
TA Series 788, 789: Ductile iron, ASTM A536 Grade 6040-18 (BS Grade 400/15)
EPDM
Handwheel:
Body coating:
Series 78K and TA Series 786, 787 – Red Polyamide
plastic
TA Series 788, 789: 2 ½, 3, 4" – Epoxy resin coated
5 – 16" – painted
TA Series 788, 789: 2 ½ – 6" – Red Polyamide plastic
Trim: (Bonnet, Stem and Restriction Cone)
8 – 16" – Aluminum
Series 78K and TA Series 786, 787: Ametal
Optional Equipment:
TA Series 788, 789:
TA Series 786, 787: Drain kit-Ametal
Bonnet – 2 ½ – 6" – Ametal
TA Series 786, 787: Insulation Kit-Polyurethane.
Bonnet – 8 – 16" – Ductile Iron
Also available on TA Series 789 2 ½ – 6" sizes.
Stem: Ametal
Allen wrench sizes:
Restriction Cone: Ametal
3 mm memory ½ – 2" TA Series 786, 788 valves
Union:
5 mm memory 2 ½ – 12" TA Series 788 & 2 ½ – 6" TA
Series 789 valves
Series 78K: Brass with EPDM o-ring
8 mm memory 8 – 16" TA Series 789 valves
Tailpiece & adapter:
5 mm drain kit ½ – 2" TA Series 786 valves
Series 78K: DZR Brass
Seat:
Series 78K, and TA Series 786, 787: Ametal
TA Series 788, 789: Ductile Iron
08.16 0930 Rev Q Updated 05/2014
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© 2014 Victaulic Company. All rights reserved.
3
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Comparison of balancing valve throttling characteristics
This curve illustrates the advantage of the four (4) turn
adjustment available with Tour & Andersson balancing
valves (½ – 2"/15 – 50 mm). Valves 2 ½"/65 mm) and
larger have 8, 12 or 16 turns.
A 90° fully open to closed valve requires just a 12°
change in adjustment to equal 30% change of the flow.
Tour & Andersson balancing valves would require a
408° change in adjustment to equal the same 30%
change in the flow.
100
90 Turn Valve
90
80
70
Tour & Anderson
MULTI-TURN VALVE
% of Cv
60
50
40
30
20
Degree of Valve Stem Rotation
10
0
12
360
720
1080
408
Degree of Valve Stem Rotation
08.16 0930 Rev Q Updated 05/2014
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© 2014 Victaulic Company. All rights reserved.
4
1440
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Dimensions:
A
A
Balancing Valve
TA Series 786 Solder End
B
TA Series 787 Female Threaded End
TA Series 786
½ – 2"/15 – 50 mm sizes
TA Series 786 Solder End (300 psi/2065 kPa)
Balancing Valve
Size
Nominal
Size
inches
mm
1/2
15
3/4
20
1
25
1 1/4
32
1 1/2
40
2
50
Actual
Outside
Diameter
inches
mm
0.840
21.3
1.050
26.7
1.315
33.7
1.660
42.4
1.900
48.3
2.375
60.3
08.16 0930 Rev Q Updated 05/2014
victaulic.com
A
End to End
inches
mm
3.50
89
3.81
97
4.31
110
4.88
124
5.13
130
6.13
156
B
Center to Top
inches
mm
4.00
102
4.00
102
4.50
114
4.31
110
4.75
121
4.75
121
Approx.
Weight Each
Lbs.
kg
1.4
0.6
1.4
0.6
1.9
0.9
2.4
1.1
3.1
1.4
4.5
2.0
© 2014 Victaulic Company. All rights reserved.
5
B
TA Series 787
½ – 2"/15 – 50 mm sizes
TA Series 787 NPT (Female) Threaded End
(300 psi/2065 kPa) Balancing Valve
A
End to End
inches
mm
3.50
89
3.81
97
4.31
110
4.88
124
5.13
130
6.13
156
B
Center to Top
inches
mm
4.00
102
4.00
102
4.50
114
4.31
110
4.75
121
4.75
121
Approx.
Weight Each
Lbs.
kg
1.5
0.7
1.6
0.7
2.0
0.9
2.6
1.2
3.3
1.5
5.0
2.3
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Valve Selection Guide:
Size
Flow Data for TA Series 786 / 787 / 78K
Nominal
Size
inches
mm
1/2
15
3/4
20
Actual
Outside
Diameter
inches
mm
0.840
21.3
1.050
26.7
Absolute Min. Flow
GPM
LPM
0.1
0.5
0.4
1.5
1
25
1 1/4
32
1 1/2
40
2
50
1.315
33.7
1.660
42.4
1.900
48.3
2.375
60.3
0.5
1.7
0.9
3.3
1.3
4.9
2.0
7.6
Nominal Range of Flow
GPM
LPM
0.6 − 2.8
2.3 − 10.6
2.0 − 6.0
7.6 − 22.7
3.9 − 10.0
14.8 − 37.9
5.0 − 15.0
18.9 − 56.8
6.6 − 20.0
25.0 − 75.7
12.6 − 36.0
47.7 − 136.0
Absolute Max. Flow
GPM
LPM
8.6
32.6
20.0
76.0
30.0
114.0
48.0
182.0
66.0
250.0
110.0
416.0
Important Notes:
Balancing valves should be sized in accordance with the GPM/LPM flows (and not in relation to pipeline size). Sizing balancing valves based on the minimum or
maximum flow rates is not recommended. Valves should be sized using the nominal flow rate only. The Minimum Flow is calculated from the minimum open setting
of the valve and a minimum pressure drop 1 Ft. WG (= 3 kPa). The Nominal Flow is calculated from the maximum open setting of the valve and the minimum
recommended pressure drop, 2 Ft. WG (= 6 kPa). The Maximum Flow is calculated from the maximum open setting of the valve and the maximum pressure drop,
20 Ft. WG (= 60 kPa). A computer program, TA-Select, is available for calculation of valve handwheel pre-set position and other applications.
Note: For information regarding Allen Wrench sizes see the Material Specifications section on page 3..
Measuring Accuracy:
The hand wheel zero position is calibrated and must not be changed. Valves have an accuracy of flow measurement of 2% to 3% when used within their
recommended flow range and installed in accordance with the figure below.
Note: For the most accurate results, a Series 734 TA SCOPE or Series 73M CMI should be used. However, any differential pressure meter may be used.
Pump
The illustration relates to the accuracy of differential pressure
measurement and is not an installation requirement.
2D
5D
2D
08.16 0930 Rev Q Updated 05/2014
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10 D
© 2014 Victaulic Company. All rights reserved.
6
victaulic.com | Balancing Valves | TA Series | Publication 08.16
CV Values for various handle settings
Series 78K and TA Series 786/787
The values below or the graph on page 16 may be
used when calculating and sizing a piping system.
A
B
B
Series 78K
Style
No. of Turns
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00 2
TA Series 787
CV Values for Sizes listed below 1
1/2"
0.15
0.25
0.36
0.66
1.02
1.60
2.30
2.92
3/4"
0.59
0.88
1.38
2.20
3.24
4.49
5.51
6.61
1"
0.70
1.19
2.44
4.20
6.15
8.00
9.28
10.09
1 psi = 2.31 ft. of H 2 O
2 Full open valve.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
B
TA Series 786
1CV = GPM at a ΔP of 1 psi/7 kPa) through the valve at any given setting.
A
A
© 2014 Victaulic Company. All rights reserved.
7
1 1/4"
1.32
2.20
3.60
5.40
8.24
11.00
13.70
16.50
1 1/2"
2.03
3.83
5.34
7.08
10.20
14.60
18.60
22.30
2"
2.97
4.87
8.35
13.60
18.80
24.90
30.70
38.00
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Balancing Valve
A
Series 78K Male and Female
Optional tailpieces are available for double reductions, or
for changing end configurations from sweat to threaded
or threaded to sweat. If needed, specify tailpiece option
when ordering.
B
Series 78K
Typical ½ – 2"/15 – 50 mm sizes
Nominal
Size
Series 78K Male x Female
(300 psi/ 2065 kPa) Balancing Valve
inches
mm
MPT Union
1/2
x
15
x
x
x
3/4
20
x
x
x
1
25
x
x
x
x
1 1/4
32
x
x
x
1 1/2
40
x
x
2
50
x
FPT Valve
1/2
15
¾
20
1
25
1¼
32
3/4
20
1
25
1 1/2
40
1
25
1 1/4
32
1 1/2
40
2
50
1 1/4
32
1 1/2
40
2
50
1 1/2
40
2
50
2
50
08.16 0930 Rev Q Updated 05/2014
victaulic.com
A
End to End
inches
mm
5.75
146
5.94
151
6.27
159
7.37
187
5.99
152
6.81
173
7.66
195
7.70
186
7.83
199
7.66
195
8.91
226
8.18
208
8.21
209
8.91
226
9.00
229
9.02
229
8.86
2.25
B
Center to End
inches
mm
4.00
102
4.00
102
4.50
114
4.72
120
4.00
102
4.50
114
4.75
121
5.30
135
4.31
109
4.75
121
4.75
121
4.72
120
4.75
121
4.75
121
4.75
121
4.75
121
4.75
121
© 2014 Victaulic Company. All rights reserved.
8
Approx.
Weight Each
Lbs.
kg
1.7
0.8
1.8
0.8
2.7
1.2
4.1
1.9
2.3
1
2.2
1.0
5.0
2.3
4.02
1.8
2.8
1.3
5.2
2.4
7.3
3.3
5.52
2.5
3.6
1.6
7.5
3.4
7.16
3.2
5.3
2.4
7.19
3.3
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Balancing Valve
A
A
TA Series 788 Flanged End
(Class 150 RF, ASME/ANSI B16.42)
D
TA Series 789 Grooved End
B
B
TA Series 788
Typical 2½ – 16"/65 – 400 mm sizes
Size
TA Series 789
Typical 2½ – 12"/65 – 300 mm sizes
TA Series 788 Flanged End (250 psi/1720 kPa)
Balancing Valve
TA Series 789 Grooved End (350 psi/2400 kPa)
Balancing Valve
Nominal
Size
inches
mm
2 1/2
65
3
80
Actual
Outside
Diameter
inches
mm
2.875
73.0
3.500
88.9
A
End to End
inches
mm
11.38
289
12.25
311
B
Center to Top
inches
mm
8.00
203
8.63
219
Approx.
Weight Each
Lbs.
kg
24.0
10.9
31.0
14.1
A
End to End
inches
mm
11.38
289
12.25
311
B
Center to Top
inches
mm
8.00
203
8.63
219
Approx.
Weight Each
Lbs.
kg
14.0
6.4
20.0
9.1
4
100
5
125
6
150
8
200
10
250
12
300
14
350
16
400
4.500
114.3
5.563
141.3
6.625
168.3
8.625
219.1
10.750
273.0
12.750
323.9
14.00
355.6
16.00
406.4
13.75
350
15.75
400
18.88
480
23.63
600
28.75
730
33.50
851
38.60
980
43.30
1100
9.44
240
10.88
276
11.25
286
17.00
432
17.75
451
19.00
483
23.00
584
25.20
640
43.0
19.6
62.0
28.5
82.0
37.5
168.0
76.5
270.0
122.9
360.0
163.9
655
297
895
406
13.75
350
15.75
400
18.88
480
23.63
600
28.75
730
33.50
851
9.44
240
10.88
276
11.25
286
17.00
432
17.75
451
19.00
483
31.0
14.1
50.0
22.7
69.0
31.3
140.0
63.7
202.0
91.9
280.0
127.4
–
–
–
–
–
–
08.16 0930 Rev Q Updated 05/2014
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© 2014 Victaulic Company. All rights reserved.
9
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Balancing Valve
A
A
TA Series 788 Flanged End
(Class 150 RF, ASME/ANSI B16.42)
D
TA Series 789 Grooved End
B
B
TA Series 788
Typical 2½ – 16"/65 – 400 mm sizes
Valve Selection Guide:
Size
TA Series 789
Typical 2½ – 12"/65 – 300 mm sizes
Flow Data for TA Series 788 & 789
Nominal
Size
inches
mm
2 1/2
65
3
80
Actual
Outside
Diameter
inches
mm
2.875
73.0
3.500
88.9
Absolute Min. Flow
GPM
LPM
1.4
5.3
1.5
5.7
4
100
5
125
6
150
8
200
10
250
12
300
14 3
350
16 3
400
4.500
114.3
5.563
141.3
6.625
168.3
8.625
219.1
10.750
273.0
12.750
323.9
14.00
355.6
16.00
406.4
1.9
7.2
4.2
15.9
5.0
18.9
30.0
113.6
70.0
265.0
115.0
435.3
83.0
314.0
95.0
360.0
Nominal Range of Flow
GPM
LPM
38.0 − 100.0
144.0 − 379.0
31.0 − 130.0
117.0 − 493.0
68.0 − 200.0
257.0 − 757.0
90.0 − 320.0
341.0 − 1211.0
182.0 − 450.0
689.0 − 1703.0
367.0 − 820.0
1389.0 − 3104.0
540.0 − 1300.0
2044.0 − 4921.0
960.0 − 1500.0
3634.0 − 5678.0
1020.0 − 2700.0
3861.0 − 10220.0
1330.0 − 3400.0
5034.0 − 12869.0
Absolute Max. Flow
GPM
LPM
290.0
1097.7
410.0
1551.9
650.0
2460.3
1020.0
3860.7
1430.0
5412.6
2600.0
9841.0
4040.0
15291.4
4950.0
18735.8
7414.0
28062.0
9371.0
35469.0
3Only the TA Series 788 Flanged End Balancing Valves is available in 14-16" / 350-400mm sizes
Important Notes (See page 5 for Balancing Accuracy):
Balancing valves should be sized in accordance with the GPM/LPM flows (and not in relation to pipeline size). Sizing balancing valves based on the minimum or
maximum flow rates is not recommended. Valves should be sized using the nominal flow rate only. The Minimum Flow is calculated from the minimum open setting
of the valve and a minimum pressure drop 1 Ft. WG (= 3 kPa). The Nominal Flow is calculated from the maximum open setting of the valve and the minimum
recommended pressure drop, 2 Ft. WG (= 6 kPa). The Maximum Flow is calculated from the maximum open setting of the valve and the maximum pressure drop,
20 Ft. WG (= 60 kPa).A computer program, TA-Select, is available for calculation of valve handwheel pre-set position and other applications.
Note: For information regarding Allen Wrench sizes see the Material Specifications section on page 3.
Note: For the most accurate results, a Series 734 TA SCOPE or Series 73M CMI should be used. However, any differential pressure meter may be used.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
© 2014 Victaulic Company. All rights reserved.
10
victaulic.com | Balancing Valves | TA Series | Publication 08.16
TA SCOPE
TA Series 734
The TA Series 734 SCOPE is a wireless, handheld device
for the swift and accurate measurement of differential
pressure, flow, temperature and power.
Link Differential Pressure Sensor
TA Series 736
An independent sensor communicates with the TA
SCOPE to deliver data quickly, thereby enabling
contractors to balance a system, troubleshoot hydronic
problems and log system performance.
Provides connection between a building’s heating and
cooling and building’s monitoring system (BMS).
Continuously measures the flow and differential pressure
through and across the Tour & Andersson balancing
valves.
The TA Series 734 SCOPE Premium is a more robust
case compared to the TA Series 734 SCOPE. See page
12 of this publication for additional details on the
TA SCOPE and TA SCOPE Premium.
Measurement probes provided for direct connection to
the measurement points on all TA Series 786, 787, 788,
and 789 balancing valves.
Differential pressure:
• TA SCOPE: 0-29 psi / 0-200 kPa
• TA SCOPE (High Pressure): 0-145 psi / 0-1000 kPa
TA Select Computer Program
TA Select helps you choose the right balancing valve,
taking the desired flow rate and pressure drop into
consideration. The software will advise the correct
combination of valve, handwheel position and pipe size
to correctly balance the system. A sophisticated viscosity
correction procedure displays the density, viscosity,
specific heat and freezing point of fluids such as glycols
and brines. It also displays the true value of flow through
each valve.
The program will also size the pipe, generate Cv values
for the ATC valves and give pre-set information for all TA
valves on the project.
08.16 0930 Rev Q Updated 05/2014
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© 2014 Victaulic Company. All rights reserved.
11
victaulic.com | Balancing Valves | TA Series | Publication 08.16
TA Series 734 SCOPE Premium / SCOPE
TA SCOPE Premium case is a robust partitioned case
that includes:
• Combined safety pressure and temperature probe
allowing automatic correction for fluid temperatures
and easier power measurements
• A large set of accessories
• Extra space for a second (optional) differential
pressure sensor and tools.
The TA SCOPE contains a reduced set of accessories
compared to the TA SCOPE Premium. All * marked
parts are included in both the TA SCOPE Premium and
TA SCOPE kits.
1. *Handheld unit (Hh)
2. *Dp Sensor unit (DpS)
3. *Digital Temperature Sensor (DTS)
4. *Measuring hoses, 20 in. red/blue
5. Safety pressure and temperature probe (SPTP)
6. Safety pressure probes (SPP)
7. Measuring hoses with twin needle, 5.9 in
8.Flashlight
9.Mirror
10. Chucks for older valves, red/blue
11. *Allen Keys 3mm/5mm
12. Spanner for measuring points on older valves
13. *Presetting tool TA Series TC/TCM/TCP
14. *Spare filters (4 pcs)
15. Chain for mounting
16. Neckstrap
17. *USB-cables for connection: Hh - DpS and Hh - PC
18. *Multi-charger for handheld, Dp sensor(s) and
TA-SCOPE Relays
19. *DC cable (2 PCS)
20. *AC cable (EU, UK, US or AU.NZ)
21. Cable wrapping
22. *Case
23. TA-Select Software
24. User manual
25. *Calibration certificates for DpS, DTS, and SPTP
26. *Quick Guide
27. SPTP/SPP instruction
28.SPTP/SPP stickers
NOTE: * Denotes this part is available in the SCOPE as
well as the SCOPE Premium.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
© 2014 Victaulic Company. All rights reserved.
12
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Accessories
• A separate drain kit with a ¾"/20 mm connection is
available for Series 786 and Series 787 valves
Drain Kit
Series 786-DK
• Kit must be field mounted
• Kit comes complete with 2 gaskets and a hexnut.
• Partcode= K-000-786-CBV
D
Probe Port
L
Style
Size
786/787
inches
mm
1/2 – 2
15 – 50
2 1/2 – 16
65 – 400
K-000-740-003
2 1/2 – 16
65 – 400
K-000-740-001
788/789
L
788/789
Part Code
K-000-740-002
L
inches
mm
1.75
45
1.19
30
3.50
89
TA Series 786/787/788/789 TA Series 788/789
Universal Gauge Meter Conversion Kit
• This kit includes 2 probes, necessary fittings, flow
wheel and instruction sheet.
• Partcode= K-000-738-100
Handwheels
Digital
Read out
0
Lock Feature/
Memory Stop
Digital
Read out
0
Part Code
Part Code
P-004-784-001
P-024-784-001
P-080-784-001
0
0
STAD
Lock Feature/
Memory Stop
Part Code
STAD
2½
Valve Type
and Size
TA Series 786/787
Plastic
½ – 2"
2½
Valve Type
and Size
TA Series 788/789
Plastic
2 ½ – 6"
TA Series 788/789
Aluminum
8 – 16"
Balancing Wheel
08.16 0930 Rev Q Updated 05/2014
victaulic.com
By using the balancing wheel it is easy to determine
the relationship between flow, pressure drop and the
handwheel setting values for all valve sizes. Order
the balancing wheel from your nearest Victaulic
representative.
© 2014 Victaulic Company. All rights reserved.
13
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Prefab Insulation
TA Series 786 & TA Series 787
H
D
B
Valve Size
inches
mm
1/2 & 3/4
15 & 20
1
25
1 1/4
32
1 1/2
40
2
50
L
Dimensions Inches/mm
Part Code
K-004-784-INS
K-010-784-INS
K-012-784-INS
K-014-784-INS
K-020-784-INS
H
5.31
135
5.59
142
D
3.54
90
3.70
94
B
4.06
103
4.06
103
L
5.51
140
6.30
160
6.14
156
6.65
169
7.01
178
4.17
106
4.25
108
4.25
108
4.06
103
4.45
113
4.49
114
7.09
180
8.43
214
9.65
245
Prefab Insulation
TA Series 788 & TA Series 789
L
D
C Min.
Valve Size
inches
mm
2 1/2
65
3
80
4
100
5
125
6
150
Dimensions Inches/mm
Part Code
K-024-784-INS
K-030-784-INS
K-040-784-INS
K-050-784-INS
K-060-784-INS
08.16 0930 Rev Q Updated 05/2014
victaulic.com
H
17.75
451
19.00
483
D
10.63
270
11.44
291
B
10.63
270
11.44
291
20.50
521
22.50
572
26.00
660
12.63
321
13.75
349
15.00
381
12.63
321
13.75
349
15.00
381
© 2014 Victaulic Company. All rights reserved.
14
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Correction Factors:
For liquids other than water, the flow values from the
balancing wheel can be adjusted as follows:
Divide the flow rate (as indicated by the balancing
wheel) by the square root of the specific gravity.
Actual Flow =
qCBI
SG
This applies to liquids having, on the whole, the same
viscosity as water, i.e. most water/glycol mixtures and
water/brine solutions at room temperature. At low
temperatures, the viscosity increases and laminar flow
may occur in certain valves. The risk increases with
small valves, low settings and low differential pressures.
A computer program (TA-Select) is available for
calculation of pre-setting values and other applications.
When the flow setting is verified or changed to the
final setting, the memory stop should be set. Contact
Victaulic for further information.
Correction Factors:
When Δp and the design flow rate are known, use
the formula shown to calculate the CV value or use
the graphs on page 17 – 19. The Tour & Andersson
balancing wheel can also be used.
A computer program, TA-Select, is available from
Victaulic for calculation of pre-setting values and other
applications.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
© 2014 Victaulic Company. All rights reserved.
15
victaulic.com | Balancing Valves | TA Series | Publication 08.16
CV Values for various handle settings
A
A
TA Series 788/789
D
The values below or the graph on page 17 and 18 may
be used when calculating and sizing a piping system.
B
B
TA Series 788
Style
No. of Turns
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
5.50
6.00
6.50
7.00
7.50
8.00
9.00
10.00
11.00
12.00
13.00
14.00
15.00
16.00
17.00
18.00
19.00
20.00
21.00
22.00
CV Values for Sizes listed below 4
2 1/2"
2.09
3.94
5.68
7.54
10.80
18.90
29.70
40.90
51.60
60.30
70.20
78.90
84.70
89.30
93.40
98.60 6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
3"
2.32
4.64
6.96
9.28
12.80
16.20
22.60
33.60
47.60
63.80
78.90
92.80
107.00
119.00
131.00
139.00 6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
4"
2.90
6.96
10.40
13.30
18.60
30.20
51.00
73.10
92.80
114.00
133.00
153.00
168.00
184.00
203.00
220.00 6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
5"
6.38
12.20
18.00
24.90
31.30
41.80
63.80
96.30
132.00
164.00
194.00
229.00
255.00
289.00
320.00
348.00 6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
6"
7.54
13.90
25.50
46.40
75.40
116.00
157.00
196.00
240.00
281.00
324.00
362.00
394.00
426.00
454.00
487.00 6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
8"
—
—
—
46.40
58.00
75.40
104.00
139.00
191.00
261.00
331.00
394.00
464.00
505.00
545.00
597.00
690.00
754.00
824.00
887.00 6
—
—
—
—
—
—
—
—
—
—
4CV = GPM at a ΔP of 1 psi/7 kPa) through the valve at any given setting.
1 psi = 2.31 ft. of H 2 O
5 Only the TA Series 788 Flanged End Balancing Valve is available in 14-16" / 350-400mm sizes.
6 Full open valve.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
TA Series 789
© 2014 Victaulic Company. All rights reserved.
16
10"
—
—
—
104.00
128.00
162.00
226.00
296.00
371.00
447.00
516.00
580.00
632.00
684.00
766.00
841.00
951.00
1090.00
1218.00
1375.00 6
—
—
—
—
—
—
—
—
—
—
12"
—
—
—
—
—
174.00
267.00
348.00
429.00
522.00
621.00
719.00
800.00
870.00
945.00
1032.00
1125.00
1206.00
1299.00
1392.00
1531.00
1589.00
1624.00
1682.00 6
—
—
—
—
—
—
14" 5
—
—
—
—
—
124.90
147.80
169.60
194.80
237.10
291.00
346.00
403.30
462.80
539.60
637.00
898.10
1096.40
1260.20
1443.50
1626.80
1844.50
2016.30
2142.30
2245.40
2337.10
2440.20
2520.40 6
—
—
16" 5
—
—
—
—
—
143.20
169.60
195.50
238.30
302.40
373.50
442.20
514.40
590.00
675.90
779.00
1024.20
1306.00
1432.00
1603.90
1787.20
1981.90
2222.50
2451.60
2612.00
2760.90
2898.40
3013.00
3104.60
3184.80 6
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Diagram
Example:
TA Series 786/787 and Series 78K
Wanted: Pre-setting for a 1" valve at a desired flow rate
of 6.7 GPM and a pressure drop of 3 ft.
This graph shows the pressure drop across the pressure
test points of the valve.
Solution: Draw straight line joining 6.7 GPM and 3 ft.
This gives CV = 5.9. Now draw a horizontal line from
CV = 5.9. This intersects the bar for a 1" valve at the
desired pre-setting of 2.35 turns.
A straight line connecting the bars for flow rate, CV and
pressure drop shows the relationship between these
variables. The position for each valve size is arrived at by
drawing a horizontal line from the CV value obtained.
Note:
If the flow rate falls outside of the scale in the diagram,
the reading can be made as follows: Starting with the
example above, we get 3 ft., CV = 5.9 and the flow rate
6.7 GPM. At 3 ft. and CV = .59 we get the flow rate .67
GPM. That is, for a given pressure drop, it is possible to
read 10 times or 0.1 times the flow and CV values.
1
100
2.5
40
100
70
3.5
2
3
70
2
4
30
20
30
25
25
20
4
20
15
10
7
0.3
4
5
5
3
3
2.5
2.5
0.2
1
0.75
1.5
1.5
1
0.7
0.4
0.5
0.4
0.4
2
1.5
1
3
1.5
1
0.5
1.5
1
10
4
0.5
5
0.5
1
2.5
1
0.3
10
0.5
2
0.25
30*)
0.5
40
0.25
1.5
50
0.25
0.25
0.2
0.2
0.5
1.5
2
1.5
0.35
0.3
0.3
5
3
0.35
0.5
0.05
2
0.3
0.7
0.1
1
4
0.5
0.4
1
2
2.5
2.5
0.5
2
2
3
4
2
2
1
0.75
4
4
3
2
2.5
2.5
3
7
5
3
4
10
0.5
1
4
3
10
3
2.5
15
0.4
0.5
40
40
1
Setting, number of turns
50
50
20
1
**)
0.15
0.15
0.5
30
*25 db (A)
**35 db (A)
0.1
100
0.1
Size
l/s
GPM
Cv
½"
Kv
¾"
1"
1¼"
1½"
TA Series 786/787 and Series 78K
08.16 0930 Rev Q Updated 05/2014
victaulic.com
© 2014 Victaulic Company. All rights reserved.
17
2"
ft.
kPa
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Diagram
Example:
TA Series 788/789
Sizes 2½ – 6"/60 – 150 mm
Wanted: Pre-setting for a TA Series 788 or TA Series
789 2 ½" at a desired flow rate of 47 GPM and a
pressure drop of 2 ft. WG.
This graph shows the pressure drop across the pressure
test points of the valve.
Solution: Draw straight line joining 47 GPM and 2 ft. WG.
This gives CV = 50. Now draw a horizontal line from
CV = 50. This intersects the flow rate scale for Series
788 2 ½" at the desired pre-setting of 4.5 turns.
A straight line connecting the flow rate scale, CV and
pressure drop shows the relationship between these
variables.
1
1000
400
1000
350
300
700
20
700
Setting, number of turns
500
8**)
7
6
400
400
300
200
8**)
7
300
150
10
200
100
7
100
5
4
70
8**)
7
6
6
5
5
2
2
4
20
5
3*)
1
2
1
10
10
2
7
1
4
10
0.5
5
1
4
10
7
15
2
0.4
5
GPM
(US)
20
1.5
l/s
08.16 0930 Rev Q Updated 05/2014
30
1
Cv
Kv
2½"
Valve factor
3"
4"*
TA Series 788/789
© 2014 Victaulic Company. All rights reserved.
18
5"*
6"*
****)
25
*Recommended area
**25 db (A)
***35 db (A)
1.5
Flow
victaulic.com
0.5
0.5
2
0.3
50
0.5
3
7
30***)
40
1
3
0.5
20
2
7
5
4
3*)
15
1
10
2
20
15
20
3
3*)
30
2
5
4
3*)
30
35
15
3*)
5
4
3
3
4
4
70
50
5
50
40
30
1
4
6
8**)
100
70
5
7
150
150
2
6
8**)
200
50
45
0.5
500
Ft.WG
100
kPa
Pressure drop
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Diagram
TA Series 788/789
Sizes 8 – 16"/200 – 400 mm
10000
278
4000
3500
200
3000
1
10000
7000
7000
Setting, number of turns
5000
4000
0.5
5000
2
4000
2000
3000
2500
100
1500
3000
2000
1500
1500
1000
1000
1000
50
700
40
30
400
350
20
700
700
500
500
450
400
12 *)
11
10
9
8
7
500
12 *)
11
10
9
8
8
10
7
9 *)
7
6
6
7
200
3
3
2
7
6
3
4
4
3
100
5
7
2
3
70
10
3
4 *)
100
150
5
9
5
200
70
4
4
5
150
3
5
200
300
1
6
4 *)
300
14
13
12
11
10 *)
8
8
5 *)
4
300
250
6
5
150
10
16 *)
14
12
10
20 *)
18
16
14
13
12
11
2000
22 *)
20
18
16
10
20
30*)
50
40
100
30
25
5
70
2
40
15
30
20
20
** 25 db (A)
15
GPM
(US)
Flow
l/s
30
10
Kv
Cv
DN
8”
200
10”
250
Valve factor
12”
300
Series 788/789
7
14”
350
16”
400
7
Ft.WG
victaulic.com
© 2014 Victaulic Company. All rights reserved.
19
100
kPa
Pressure drop
7 Only the TA Series 788 Flanged End Balancing Valve is available in 14-16" / 350-400mm sizes.
08.16 0930 Rev Q Updated 05/2014
**)
25
*** 35 db (A)
15
50
50
* Recommended area
20
4
3
50
40
victaulic.com | Balancing Valves | TA Series | Publication 08.16
Typical Specifications:
These valves shall have eight (8), twelve (12), sixteen (16)
or twenty-two (22) 360° adjustment turns of the
handwheel for precise setting with hidden memory
feature to program the valve with precision tamper-proof
balancing setting. Handwheel shall have digital readout.
The handwheel can be installed in any position without
affecting performance.
SERIES 78K – (½ – 2" M x F)
TA SERIES 786 STAS – (½ – 2" SOLDER WITH DIGITAL
HAND WHEEL)
TA SERIES 787 STAD – (½ – 2" NPT)
TA Balancing Valves ½" through 2":
Furnish and install, as shown on the job plans, TA Series
786/787 Balancing Valves with provision for connecting
a portable differential (Ft. of Head) pressure meter. Each
meter shall have pressure/temperature probes.
300 psi/2065 kPa, y-pattern, globe type with soldered
or threaded ends, non-ferrous Ametal® brass copper
alloy body, EPDM o-ring seals. 4-turn digital readout
handwheel for balancing, hidden memory feature with
locking tamper-proof setting, and connections for portable
differential meter. TA Series 786 STAS or 787 STAD.
The balancing valves shall be Y-pattern globe style
design and all metal parts of nonferrous, pressure die
cast, nonporous Ametal. Each valve shall provide four
(4) functions:
TA Balancing Valves 2 ½" through 16":
(1) Precise flow measurement, (2) Precision flow
balancing, (3) Positive shut-off with no drip seat,
eliminating the need of an additional isolation valve,
(4) Drain connection using 3/4 " NPT hose end thread.
250 psi / 1725 kPa (TA Series 788) 350 psi / 2400 kPa
(TA Series 789), y-pattern, globe type with flanged or
grooved ends, ASTM A536 ductile iron body, all other
metal parts of Ametal® brass copper alloy, EPDM O-ring
seals. 8, 12, 16, 20 or 22 turn digital readout handwheel
for balancing, hidden memory feature with locking
tamper-proof setting, and connections for portable
differential meter. TA Series 788 STAF or 789 STAG.
These valves shall have four (4) 360° adjustment
turns of the handwheel for precise setting with hidden
memory to provide a tamper-proof balancing setting.
Handwheel shall have digital readout. The handwheel
can be installed in any position without affecting
performance.
Purchased TA CBI-II or TA CMI balancing instruments
are to be left with the project owner upon completion of
the project.
TA SERIES 788 STAF – (2 ½ – 12" FLANGED WITH
DIGITAL HAND WHEEL)
Balancing Meter:
TA SERIES 789 STAG – (2 ½ – 12" GROOVED WITH
DIGITAL HAND WHEEL)
If a balancing meter is required to be left with the owner
after commissioning, the balancing meter shall be from
the same provider as the balancing valves, Victaulic/Tour
and Andersson. The Series 734 TA-Scope, or TA Series
73M CMI Pressure Differential Meter are acceptable and
are manufactured by Tour and Andersson. Needle gauge
type meters will not be allowed.
Furnish and install, as shown on the job plans, TA Series
788/789 Balancing valves with provision for connecting
a portable differential (Ft. of Head) pressure meter.
Each meter connection shall have pressure/temperature
probes.
The balancing valves shall be Y-pattern globe style
design with ductile iron body all other wetted parts of
nonferrous, pressure die cast Ametal. Each valve shall
provide three (3) functions:
INSULATION:
For insulation against heat loss or condensation.
Preformed rigid polyurethane insulation is available
for ½ – 2" TA Series 786/787 valves and for 2 ½ – 6"
TA Series 788/789 valves.
(1) Precision flow measurement, (2) Precision flow
balancing, (3) Shut-off feature, eliminating the need of
an additional isolation valve.
Installation
Reference should always be made to the current TA Hydronics installation/assembly
instructions for the product you are installing. For coupling and strainer installation,
reference should always be made to the I-100 Victaulic Field Installation Handbook for
the product you are installing. Handbooks are included with each shipment of Victaulic
products for complete installation and assembly data, and are available in PDF format on
our website at www.victaulic.com
Note
This product shall be manufactured by Victaulic or to Victaulic specifications. Victaulic
recommends all products to be installed in accordance with current TA Hydronics
installation/assembly instructions. Victaulic and TA Hydronics reserve the right to change
product specifications, designs and standard equipment without notice and without
incurring obligations.
Trademarks
Victaulic ® is a registered trademark of Victaulic Company.
Warranty
Refer to the Warranty section of the current Price List or contact Victaulic for details.
08.16 0930 Rev Q Updated 05/2014
victaulic.com
© 2014 Victaulic Company. All rights reserved.
20